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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00e2e04ed3331a1e7893ff122e5f91edab5c3ff62ddff2cef44e828e8f014ff9' 
  AND token = 'BfKiJOQcRcFYqo5YruTFvl9R+JcNJONtstrrR0bQoAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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