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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdeff219496c37e82900aa7b254439832f2cd110e5a06c56db60e0b228554dc3' 
  AND token = 'DEJaNsnWANVnqLgqORFv1t3bTANB99hRBDz4Nbfacxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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