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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dcec6e4eb451c03b4b319ac0760819774e9390be2a5b7e95f5259cfda8f3017' 
  AND token = '3VhyRJ209y6yRjObLvyC+TnSzqFjth5GNe5XrsWt5PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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