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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29eb88478e03c7b087ff03b564c53409647a1dd02c32cfc8065ea5aee9ef470c' 
  AND token = '3B1Ha9gilXnECNw4qqTYw9OF4F4vcLhNnezqMH8yrsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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