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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db268bef2e4295c7ea8d6b6461ee9968b502087c0186eb3785330ae2491bbe16' 
  AND token = '68Z5CCTpcYt+W2SQMzVO+lh2n4CvYlEqeTnoLVQ8dt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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