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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a08f992ba7e18d6d7f6bef518ef744caaca53af98b4dd1968ae15ae44c1d892' 
  AND token = 'ytQKpO4y+WmNZ2j6EkGlwTPbz7btchaPBLuQ9yxYrfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00495

JSON explain

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