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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c037f47c34cd86dc31c067bab19a3964d42cd63f076102d7e434053cf5de6e9' 
  AND token = 'b8iZPqHQFzgntzSGo+sU2dEbup7Tmce/v6fVOhy2ytQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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