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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef0b4d34c426ab7c29a233428cb5e8b7347bba986b2389dee29abe989f13a67d' 
  AND token = 'k7XeEdH/OrmwVBlnelVv97ZI9tbpAdzmD8ZGvHf64iI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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