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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8242a38f6b996e8c9fd0c525afd8ba737796cb535e3bb562cab1ae2b114977f' 
  AND token = 'cPhw2gcVwoykoQkslZeiU5t3X7R/6NZdIeTquc+r8JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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