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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba0a34a48912608bb60482a3e92aebb84620aa3e9653260f20710ce942ae74f4' 
  AND token = 'h0f+ta2hRu8yhGOHm+ua3IpGcCjXxFTQ3Hx0gZBS0uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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