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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6889ce203b5ea28e30bb9b83723db9a1c45d947abba82ac1e5f3b9262a48504' 
  AND token = 'Qa4VEP7xnTHSLzw/N0Q3OkJsslTbF8mATdcg0SljT84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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