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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ccfb8dab49559851fe3cdfaa965a7da57dd666fa5d96403ee337b70b2319ec9' 
  AND token = '8g089wYZcTc1kWqLq4N0UTkqdGXUJMPZS2Ut+XbROhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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