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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74f0b2e130abcd0ce9359d5e49870bbf9bf1d03c71e52f632dfc762f57930759' 
  AND token = 'ZC4027EdCuFjAWWdqQHPHAxIH+M5I2AqKGsh56KtrLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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