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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0562d03cbcce694629e4c74c1ed8b6d8df63c6fbd20ffa0c7ebef383a566383' 
  AND token = 'hG72Ie5x++IeqIbuMLmx0w207BzsRJ0qw/EPnVN4LMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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