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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d89505814482d6a70390fe83a4133bbec4246ba31c40d3243903256646c7eff' 
  AND token = 'C8gCql9ba6QV/mnmVV4D2pc9svbIS5ZHck/wAXegBuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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