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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66d375b9ef1ca9cdb8416eb9ce6fcd7ca62bc461da5d3178aa8304c85c40d5c6' 
  AND token = 'SPUCcaaNIuljmx5bVEk3iK0222cNCX63CvKiUQ0GCXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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