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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0776a045800598ec8be7350139fbd6db3f1d8de37d7b8fb89fdeb28e0516d4f' 
  AND token = 'T0m7lx1MXxrQ6pwYYpwI1jOyGWy8S4doIiQ3j+TPKCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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