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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9232726805c7955b43b42befc70d63090bf5de663e546b0d36b63bebf92c19be' 
  AND token = '8KvK2IZ/MuHr4A9MN9Kn9cjZN6g+PR7HW+xqzaMCKmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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