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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '755ca034ba4f1b22d0d352b9af06d6b5c0e71f14bdcceb15f1e273451bb74b43' 
  AND token = '9y11A8RT09qEP67GtP2e5hexVzg2ap1zD4vANmfH8F0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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