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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '074fdc57c65c8604be5c65b4764ff73cdfe51e89aabf2860c5ff7d55e2213e7f' 
  AND token = 'pzDScTBVrIrZQhAJWeVRl9ymY2w1UINVMZDC+16ETwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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