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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ce3062fa98f2564d5689769daf86f4d882c1f8472fd26046c674f95892834a3' 
  AND token = 'sUwRgDNfVSlo6D7jCJC7uM5d0hzi3BZRT3r/touNmME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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