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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce505c03d5fbb2640aa6ab81fc8903ce16eef048bae52a81d95380c7043ac55e' 
  AND token = '/8HVMYf5r2+ULL3Vy95qfrHc8qD2NEKYHc0JiTDLrs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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