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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b068e01320def3cb14371dc8bc6bc6cd9b46f9899195d09be15b64e9c568ac0d' 
  AND token = '8Tlfas7CqeEkpSrpPuG3QPkoh3TXM70h8+OWiMPL1JY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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