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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a217aa9bdb6893219049beb80d807bf691f29c91524c7871409e0a77c1d7aac9' 
  AND token = '1yr7eALDjIg+3WsCpR5X2rn1Kb6WvGr9slLgS8oBbM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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