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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '360e1dd5c4c280010c371918d5efdcf3820e52a4884536fb90732146d440e826' 
  AND token = '7Nea1/1C1870Sgw4rEVAT47K/ml0YV7Wglmt8dyzOrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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