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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '429ccd19ba1fdd5a0ca085baed98a1f11301b30b4dbe0434652021a84ca7bbbc' 
  AND token = 'McPB6G9pOSKzCdF8W+LwQUwcaep3YX4Ua6i7B1SQBpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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