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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '010990b4f08d7725ff0eb702d197b3eba2b82cead9b46d34b6e99c74673aa6b3' 
  AND token = 'VMOsIO7UWb37TlYv2ihDYdX0Cl61s7InJHo3Rf7xvKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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