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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27012816f2f76d89cc37f9cb761c070731295a70df83abfcd9eedbd10d7f334b' 
  AND token = 'ymwJ052mf3JwPdWtMTtpF0Y7odaZ/MuZVzk0jFtSABk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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