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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83a259339a527cca912631aef08fde6066d4ef362f3e71fbfb5d9211178a14d6' 
  AND token = 'SLx2adX5oqUg8+FacfLS1Kh1tiH+eOSqJEEF8rg+Uno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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