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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5f9b7897d2bed9b9c04f7d0b9edb5f0634f657b27cc0e81467197d054f2e05e' 
  AND token = 'f3ZSyh0hN8IBWORmLrfNXWTePDVUJ4q1CcJm7VNshbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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