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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23d6ced1f01224036e4529a9e3717f1e019ff6981ff97c05746109dfbb3c0631' 
  AND token = 'AIpPyOXICD3x2UV/8lgnsrl3iWK+nAHLthTZf0cuIyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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