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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c91e376dc06d85b8f714e66d8f305b11e33d30fb9f702b3b82e25ec0ef4e98ce' 
  AND token = 'DiUqcD7Kdd2SVaI4CVFhXAm94RZCCqKOXU1TDEaTbbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}