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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1d3e77ee4b51009405d10eb2d55482971e7b1ff4f08cd1f9af2fcf2111f0423' 
  AND token = 'ALdGwQGF8NBeFKZyB+0FgHXS8My/8kUNfZFHgWJVBjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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