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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09455641a7087fdef09e75037bb079182d1703d009d8958af4bee6354b1042e7' 
  AND token = '6TzFJ0OQk/GTama0KvyzR45lTjlQBlYDfBrDB2kE7+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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