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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '377cace74bb0fad7b41378cf7e9494cc4962ecf790e0680289cb5a67ae5a2918' 
  AND token = 'gUdvi2J/Fti15t5okneTMtu3vFKLHdtRinpa1I3vttI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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