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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b86383f5b93ab121bcd0aef8bd09584e4f8f50bb4a4a65dc1f691f86ad16bf40' 
  AND token = 'zDZKdwBUyR7vv2fWWjM6H28VMeMGnLn1Zt/9QdaYLjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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