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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ab4933d9b9ea0461438371d53b22b2f7799cc61f7f98231b87ef02e01787df1' 
  AND token = 'kx1uhz7CGZmwjjCieSlufktIMZkI3bPcgum8Nb90Nyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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