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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5938431f88750bac3a4ea084f8535e3955b96f01f55f3a8f076f1c5c1d6e5db3' 
  AND token = '6tLGC7Ktvp0t7EaauejwRbFdQIojtNf+JGEvUtFYJ2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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