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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09fafd1ab0b9c8071132de9c63fb8534beeb84292f640e115782feb9b9fcee80' 
  AND token = 'Ma8/N4kp9J5kpQ8vPnnaVlRei944kohwEIps1w4ChX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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