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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d76921a710c9adcd0362c6160b7858d5df4f80bdaf6e303165c88ad648e7a63' 
  AND token = 'AT03cgnl1aR8c/4/k46nbbkzH3oX3FHC2qtujP7j410=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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