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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a69cbb0a693d2a99c0f812b3eb72caf609215f24a15ba6c9d0020248db3edb0' 
  AND token = 'ukXPZx2UkQwU4J6rtZyVumlk0XYgYoLnyJwIWYM3bss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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