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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50986aee6567593ee6803e79479db09bc40e189b13e80719576e491f186075a2' 
  AND token = '2Zx2C+IIn0COBf5fyyUEv/siZIExk9VdoJrlg3sdraA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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