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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c96eae86d5f11ccdad9a3150f916373c4e2ffe816a46d1f6936fa58ded242c6' 
  AND token = 'ZvxeH/ldmoEal0WmHl3dYb/ByShFc2R6D5YNhDB+Pps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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