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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe23b5e9f8642b226755b75646fb48a2710aa4ba8bdc56e203f537a545a01898' 
  AND token = 'PF5lTwSwvmKQsdrl68zdhWF882EfVgFm+yC8H1REIUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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