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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8f7c20632ff5293cd1acde6b5f7aba776108ae5110ea283500f2e0638f6cafe' 
  AND token = 'awcl1LkOFx/X+dC29EGHYW0hRgJbfly76CLuD3ULa00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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