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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b2c509e6f398657a42dfe70d4e4cdef57ed7f299fcaa9c91c15bf31eff37a73' 
  AND token = 'wAiWxncBjMfIC+In3Od6pT3gzPEx13lotM9ZWwaAyFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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