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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7be214d2b60cc594f7321bb72c7433ef4ff9a91090e37e2c9f674cb407ddf69' 
  AND token = 'CrvUpdGJJglwU0tRVJx0/udU6rnQbVs9HXB4KD4hyYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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