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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78ef2c7280f31324bc11fed466ea10e6dd34b0f2df73fb5189a6903ef73cc682' 
  AND token = '/9QGzZXtWM6RA352ELTx2WNIU/9VwaGpooomXiOMxs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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