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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdd0ab87b66cac60ef92644d5571791ad2306a419f13e9c98a1117925ea4cbdf' 
  AND token = 'JkvfxsYZC4ly4LkEYZVf/Dtks7sWr1j8Jt/0jJBnmnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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