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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4890f1755a0e35d9d701bdfc2d908eb5682b638e757e24fddc4147bac5e6dbbd' 
  AND token = 'LuPb2XXbXCI09Y+JXcvnEZug7LvdwnTC9abIZQNMfSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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