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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '950d1ba883869ab3ec2c8c1c332e34eb33901eabb5136260aa2211b762a3ab77' 
  AND token = '2xmA+uLQqpEjypulZhHXK8Kc522TULD/4DXcMbz2o2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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