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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd87f042262a38917cb3fa124007a70771faa22c83b6019843ef6fc1e65a4be01' 
  AND token = 'zhh9ZwCxX9ED/aCy8XAd95bJmLBfZ9o5FamiSMvg5cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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