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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc1b1bf43f5854f3c1f09466f4123c12929c90f891c5e1f892966110a07cbd2a' 
  AND token = '/31NF7vG0QkJoQhdU8fRWCBL5rjawMLALDQ+UzpV1oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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