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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faa482d56ce8654944350d2ecdc2128ea74b5f6c699f3e2571446da77698b7a7' 
  AND token = 'B2EMtdo4YP4OiF5D/+U74aNIwu78Nwg6u8XNQtnFQ5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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