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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f00edc49d7a7c3f40cedfeae70f5004fa717154b69fc4f316a756a0f55e3d4ec' 
  AND token = 'VACrFH/600tBKlgM/zToi4s7ivSLp3ybARNNwpcu39Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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