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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab51cd822c75bcd249bca29f4b3493033d1d5a5531199048add4a6400aa98ae8' 
  AND token = 'njgueu0o4TAipP+C316tHyMUsFcqVjCXq12V+ttYbYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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