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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0d50771a92f5eaf6e7022b75f33c1bb91cd9d8b4db6c15f6dc49c9d7e23183e' 
  AND token = 'Seo1JGJ407sjN0yRJMHWKI02clJ2NrxBJt1z6oH+K68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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